adverse / averse
Hostile conditions versus a person’s dislike.
Adverse describes things: conditions, effects, weather, rulings. Averse describes people and their reluctance, and it takes to: averse to risk. Do not use adverse to for a person’s dislike, and do not use averse weather.
Examples
UseThe drug caused adverse effects.
UseThey flew despite adverse weather.
UseShe is averse to publicity.
AvoidShe is adverse to publicity.
AvoidThey flew despite averse weather.